JP3247707B2 - Biodegradable molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable molded article made from a protein-containing raw material which can be uniformly mixed with water, and which can be decomposed by soil bacteria or microorganisms.

[0002]

2. Description of the Related Art Plastics are widely used as molding materials such as containers and packaging materials. However, these plastics have serious difficulties in disposal, such as low biodegradability and emission of harmful gases during incineration, and have become a serious social problem.

Therefore, conventionally, a wheat gluten molded product as disclosed in JP-A-2-67109 has been reported as a molded product. The gluten molded product is obtained by mixing wheat gluten and water using a mixer or the like to adjust the water content to 5 to 70% by weight, dispensing a predetermined amount into a molding die or the like, and performing heat and pressure molding. It is made. Since such a gluten molded product is decomposed by bacteria and microorganisms in the soil, by burying it in the soil, disposal treatment is simple and has no problem, and it is highly safe as a food container.

[0004]

However, the molded product made of wheat gluten has a problem that the workability is poor in the production process due to the following reasons.

[0005] That is, when the above-mentioned wheat gluten is mixed with water, it is easy to form fu and sesame, so that it is difficult to mix evenly using a mixer or the like. In addition, a mixture of wheat gluten and water is difficult to obtain a uniform composition because unevenness and stickiness occur, and when a predetermined amount of this is measured and dispensed into a pressure molding die. It also takes time.

[0006]

In order to solve the above-mentioned problems, the biodegradable molded product according to the first aspect of the present invention is used as an auxiliary material for soybean protein, egg white, whey protein, egg yolk or collagen. It is characterized by being formed by pressing a raw material obtained by further mixing water with a mixture of sugar and water.

[0007]

The biodegradable molded article of claim 1 contains soy protein, egg white, whey protein, egg yolk, or collagen as a raw material. Therefore, when producing a biodegradable molded product, uniform mixing of water with a protein-containing raw material and water can be easily performed without forming fus or lumps generated when conventional wheat gluten is used as a raw material. It can be carried out.

Therefore, the above-mentioned protein-containing raw material does not cause unevenness or stickiness and has good fluidity, so that workability is improved, and for example, a predetermined amount is distributed to a mold or the like. When casting and molding, weighing can be performed easily. Furthermore, the use of the above-mentioned protein makes the biodegradable molded article excellent in appearance such as having a transparent feeling.

Further, the biodegradable moldings, and auxiliary material <br/> Te, sugar is used. This can impart flexibility to the biodegradable molded product.

[0010]

The present invention will now be described by way of examples, which should not be construed as limiting the invention.

[Examples] Using soybean protein powder, sugar and water as raw materials, Table 1
Into a mixer with the composition shown in
A mixture consisting of protein, sugar and water was obtained. Then
Place the above mixture in a mold previously heated to 110 ° C.
Quantitative weighing and dispensing, press molding with 2.0t load for 1 minute
Was. Take out the obtained molded product from the mold and let it cool at room temperature
As a result, a cup-shaped molded product was obtained.

According to the above method, as shown in Table 1,
Raw material composition of soy protein, sugar, and water
5) different biodegradable molded articles were produced. Soshi
Then, the mixability of soybean protein, sugar and water at the time of production of each molded article, the moldability and flexibility of each molded article obtained were evaluated, and the results are shown in Table 1 .

The above-mentioned flexibility was measured using a rheometer NMR-2010J-CW manufactured by Fudo Kogyo Co., Ltd. That is, after fixing the produced molded product to the sample stage, the plunger was lowered from a predetermined position above the sample stage until the molded product was broken, and the distance the plunger was lowered until the molded product was broken was measured. .

[0014]

[Table 1]

[0015] As is clear from Table 1 , any of the blended products enables uniform mixing of soy protein, sugar and water, has good workability, and can be weighed for dispensing into a mold. It could be done easily. Moreover, each molded product had sufficient moldability.

Further, by mixing sugar in the raw material, a molded product having flexibility was obtained as compared with the case where sugar was not mixed. Furthermore, it was found that the flexibility of the resulting molded article increased with an increase in the amount of added sugar.

Each of the above molded products was buried in the soil, and was decomposed by microorganisms and bacteria in the soil in about two weeks.

Comparative Example The same operation as in the above example was carried out except that wheat gluten and water were used as raw materials in the composition shown in Table 2 .
Eight types of biodegradable molded products having different raw material compositions were produced.

The mixability of wheat gluten and water in the production of each molded product and the moldability of each molded product were evaluated, and the results are shown in Table 2.

[0020]

[Table 2]

As is clear from Table 2, when wheat gluten was mixed with water, flour and lumps were produced, and uniform mixing with water was difficult. And since the mixture of water and wheat gluten has unevenness and stickiness and poor workability,
When dispensing into a mold, it was also difficult to measure a predetermined amount. Furthermore, when water was mixed in an amount of 150% by weight or more with respect to wheat gluten, the moldability was not sufficient.

As described above, each of the biodegradable molded products in the above examples is obtained by mixing soy protein, sugar and water,
This mixture was dispensed into a mold by a predetermined amount, heated under predetermined conditions, and pressed and molded.

The soybean protein is a protein that can be uniformly mixed with water. A biodegradable molded product formed from this protein can be easily mixed with water in the production process. Can be performed, compared with the case where wheat gluten is used as a raw material (comparative example),
Since workability is improved, weighing at the time of dispensing into the mold can be easily performed.

Further, the biodegradable molded product in the example is decomposed in about 2 weeks by bacteria and microorganisms in the soil, similarly to the molded product made of wheat gluten in the comparative example. By burying it in the soil when it becomes a waste, there is no problem in disposal.

As the protein which can be uniformly mixed with water as described above, in addition to the soybean protein used in the above-mentioned embodiment, for example, whey protein, egg white, egg yolk, collagen and the like can also be used. It is possible.

In the above example, sugar was mixed with protein to obtain a biodegradable molded product. As described above, a molded product can be obtained even when sugar is mixed with protein as an auxiliary material in a range of 1% by weight to 900% by weight. In addition, cereal flour, oils and fats, plasticizers, emulsifiers, insoluble mineral substances, or a mixture thereof may be used as an auxiliary material.

The temperature of the mold used for pressure molding is not particularly limited, but it is preferable to heat the mold in advance at 50 to 160 ° C.

In the above embodiment, pressurization is performed for 1 minute under a load of 2.0 t. The pressure at this time may be a pressure at which the mold into which the mixture is injected is sealed. Pressure may be applied.

[0029]

As described above, the biodegradable molded article according to the first aspect of the present invention is used as an auxiliary material for soybean protein, egg white, whey protein, egg yolk, or collagen.
It is formed by pressing a raw material obtained by further mixing water with a mixture of sugar and water.

Therefore, when producing a biodegradable molded product, uniform mixing of a raw material containing a protein and water can be easily performed, so that workability is good and, for example, using a mold. When pressure molding is performed, when a predetermined amount is dispensed into the mold, there is an effect that a molded material raw material uniformly mixed with water can be easily measured. Further, the biodegradable molded article also has an effect of being excellent in appearance such as having a transparent feeling.

The above-mentioned biodegradable molded article is used as an auxiliary material.
And sugar is used.

[0032] Thereby, there is an effect that flexibility can be imparted to the biodegradable molded article.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C08L 89:00 C08L 89:00

Claims (1)

(57) [Claims] (1) soy protein, egg white, whey protein,
A biodegradable molded product, which is formed by pressing a raw material obtained by mixing a mixture of egg yolk or collagen with sugar as an auxiliary raw material and water.